Blagdon Affinity Ice Vent Heater

Blagdons Affinity Ice Vent Pond Heater has been designed to keep a part of your pond's surface from freezing over. Contrary to popular belief it is not essential to stop the whole surface freezing - as long as part of the surface is kept from freezing, gases will be allowed to escape and the pond can continue to "breathe."

Otherwise all the toxins that fish waste and leaf debris release will stay trapped in the water and poison your fish.